Hi @rueben.tiow , thanks for the response.
To iterate I think I would need to iterate through all the users right? I’m wanting search the entire user database for anyone that has the intended secondary emails (social connections like Github and Bitbucket have these)
I did look at the account linking extension but it didn’t check the secondary emails, only primary ones.
Another option I can think of is that whenever a user logs in with their Github account is to use that time as an opportunity to update the user’s metadata field with the emails, then use the v3 search to look inside metadata. That could work.